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run code in 150+ php & hhvm versions
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<?php echo var_export(array('type' => 'object', 'properties' => array('one' => 'one')) + array('properties' => array('two' => 'two')));
Output for 4.3.0 - 5.6.28, 7.0.0 - 7.1.0
array ( 'type' => 'object', 'properties' => array ( 'one' => 'one', ), )
Output for hhvm-3.10.0 - 3.12.0
array ( 'type' => 'object', 'properties' => array ( 'one' => 'one', ), )1